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Question: the life expectancy of a particular brand of battery for...

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The life expectancy of a particular brand of battery for wristwatch is normally distributed with a mean of 20,000 hours and a standard deviation of 4,000 hours. What is the probability that a randomly selected battery will have a life of at least 17,000 hours:

Select one:
A. 0.2266
B. 0.7266
C. 0.7734
D. Cannot be determined with the given information
The life expectancy of a particular brand of battery for wristwatch is normally distributed with a mean of 20,000 hours and a standard deviation of 4,000 hours. What is the life expectancy of a randomly selected battery that has the probability of 0.90:

Select one:
A. 25,120 hours
B. 25,160 hours
C. 29,600 hours
D. 29,800 hours
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